The Sony 21mm Ultra-Wide Conversion Lens for FE 28mm f/2 (SEL28F20) Lens broadens the angle-of-view of the 28mm f/2 lens to 92º for an ultra wide focal length equivalence of 21mm when used with full-frame cameras. As this converter lens is uniquely compatible with the FE 28mm f/2 lens, it transmits EXIF data through the host lens to the camera.
The optical design of the converter lens is comprised of 4 elements in 4 groups and when on the 28mm lens, it provides a maximum aperture of f/2.8 and a minimum manual focus distance of 7.9". When the lens is used with an APS-C E-Mount camera, the converter lens provides a 68° angle of view and a 31.5mm focal length equivalent. It is a compact addition to the 28mm lens with a bayonet mount and features a built-in petal-type lens hood.
| Name | Value |
|---|---|
| Brand | Sony |
| Focal Length | Full-Frame Camera: 21mm APS-C Camera (35mm Equivalent): 31.5mm |
| Type | Converter |
| Aperture Range | On 28mm f/2 Lens Maximum: f/2.8 Minimum: f/22 |
| Format | 35mm full frame *2 |
| Focal Length | 21mm *3, 35mm equivalent focal-length (APS-C) (mm): 31.5mm *3 |
| Lens Construction | (groups-elements)4-4 |
| Angle of View | Full-Frame: 92 APS-C: 68 |
| Minimum Focusing Distance | On 28mm f/2 Lens Autofocus: 9.4“ (24 cm) Manual Focus: 7.9“ (20 cm) |
| Maximum Aperture | 2.8 *3 |
| Minimum aperture | 22 *3 |
| Maximum Magnification Ratio | Autofocus: 0.15x, Manual Focus: 0.20x |
| Minimum Focus Distance | 0.24(AF) *2, 0.20(MF) *3 |
| Dimensions (Diam. x L) | Approx. 72 x 51 mm |
| Weight | 267 |
| Dimensions (DxL) | 2.8 x 2.0“ (72 x 51 mm) |
| Filter Thread | Not Specified by Manufacturer |
| Dimensions | 72 x 51 mm |
| Lens configuration | 4 Elements / 4 Groups |
| Focal length | Full-Frame Camera: 21mm APS-C Camera (35mm Equivalent): 31.5mm |
| Angle of view | Full-Frame: 92 APS-C: 68 |
| Maximum aperture | On 28mm f/2 Lens: f/2.8 |
| Minimum aperture | On 28mm f/2 Lens: f/22 |
| Maximum magnification | Autofocus: 0.15x Manual Focus: 0.20x |
| Filter size | Not Specified by Manufacturer |
| Minimum Focusing Distance | On 28mm f/2 Lens Autofocus: 9.4" (24 cm) Manual Focus: 7.9" (20 cm) |